Hi,

Does anybody know if I can use hooker 2055 shorty headers for my -85 Trans Am 305 lg4? They are specified to be used with 86-90 TPI cars but since Ill hook them up with a 3" high flow cat they should work shouldnt they? Is there something else that differs between the cars that Im overlooking?

Hasse

 

They are made to mate up with '86-'90 TPI single cat exhaust. Any other type will require some modification.

In your case, you will eliminate the EFE valve. No particular heartburn there (I still passed visual emissions inspection). And, the A.I.R. check valve on the driver's side will be pointing in the wrong direction. I used two brass elbows and a 4" piece of pipe to put it back where it belonged.

If you use an '86-'90 TPI direct-fit single cat, it will hook up to the 2055 y-pipe beautifully. That's what I wish I had done. Spent more money on the money-saving 3" high flow universal cat getting the system together than I would have if I just would have gotten the direct fit. If you aren't getting a cat-back, then you will need to modify yours to get it to fit the cat. But, the LG4 cat-back is terrible, so get that while you're at it.

 

thanks,
What is the EFE valve? In Sweden there is no emmissioncontrol on vehicles that are pre 88. Can I remove the Air-PUMP(is this the so called smog-pump?),the AIR-things on the headers and the cat?

Hasse

 

EFE = Early Fuel Evaporation. There is a valve at the outlet of the passenger side exhaust manifold that closes when the engine is cold, sending exhaust through a passage under the intake manifold, warming it up so fuel doesn't pool in the intake manifold. As the engine warms up, the valve opens and allows normal exhaust operation. I haven't had any problems without the valve being there. You have to plug one vacuum line when you remove the EFE valve.

No problems removing A.I.R. I ran mine for almost 2 years before I installed it for emissions testing a couple of weeks ago. It is indeed the so-called "smog pump".

If you don't have to worry about emissions, you can remove the catalytic converter as well. Just put a straight piece of pipe in its place.

 

I highly recommend getting coated 2055's. ...even if it doesn't bolt up directly to your cat. Since you don't have to worry about emissions....cut the cat out, install the headers, and drive softly to the nearest exhaust shop. They should be able to sew it up nicely for not too much money.

The 2055's are great.

 

why not get jet hot coated hooker 2460s and have a custom y pipe made

 

Because the y-pipe it comes with is a quality piece, and it comes coated as well. As compared to a frankensteined y-pipe uncoated. Worth the few extra bucks for me. No telling how much a shop would charge you to make the pipe, and to coat it would require twice as much shipping to Jet-Hot because you'd have to have the headers on to fit the y-pipe.....I'd be quite suprised if you got an equal product for a lower price.

Just IMO, though.

 

Hi,

Would it be possible to cut the AIR-fitting and weld it back again in the correct direction for an lg4? This would look better than using elbows and pipe wouldnt it?